Tape pulling device



Jan. 31, 1939. A. D. EITZEN TAPE PULLING DEVICE Original Filed Dec. 9, 1933 3 Sheets-Sheet l w a w x 7 w a 3 1 1 x H M g 9 WW. 9 J M 9 a .0 7 3 5 5 w W d 4. 5 a. M .m w *a v M I W fl m 0 g a 5 J 2 f U a7 a INVENTOR A ustllflivzm BY ZMAY ITM Q W A TORNEY Jan. 31, 1939 Original Filed .Dec. 9, 1935 A. D. EITZEN TAPE PULLING DEVICE 3 Sheets-Sheet 2 INVENTOR- ATTORNEY Jan. 31, 1939. E|TZEN 2,145,251

TAPE PULLING DEVICE Original Filed Dec. 9, 1933 3 Sheets-Shei 5 ATTORNEY Patented Jan. 31, 1939 TAPE PULLING DEVICE August D. Eitzen, Rockville Centre, N. Y., assignor to News Projection Corporation, New York, N. Y., a. corporation of New York Application December 9, 1933, Serial No. 701,615

Renewed May 1'1, 1938 14 Claims.

This invention relates to tape pulling devices in general and more especially to tape pulling devices which are electrically or magnetically controlled.

Among the objects of the present invention it is aimed to provide an improved tape pulling device including a tape pulling roller, an electric motor, and a magnetic clutch for connecting the tape pulling roller to the electric motor.

This application constitutes in part a continuation of my application for patent, Serial No. 329,028, filed December 28, 1928, Patent No. 1,978,421, dated October 30, 1934.

These and other features, capabilities and advantages of the invention will appear from the subjoined detail description of specific embodiments thereof, illustrated in the accompanyin drawings in which Figure l is a diagrammatic view of one embodiment in which the switch for the inagnetic clutch is controlled by the presser or feed arm of the ticker;

Fig. 2 is a diagrammatic view of a portion of another embodiment in which the switch for the magnetic clutch is controlled by the loop formed in the tape between the ticker and the projector;

Fig. 3 is a portion of still another embodiment showing another relation of the several connect- -ing elements between the electric motor and magnetic clutch;

Fig. 4 is a front elevation of the pulling device illustrated in Fig; 1; V,

Fig. 5 is a front elevation partly broken away of another embodiment made according to the present invention;

Fig. 6 is an enlarged plan view partly in section of the pulling mechanism shown of still another embodiment with the electric conductors and associated parts shown more or less diagrammatically; and

Fig. 'l is a section on the line 'l'| of Fig. 6.

In the embodiment illustrated in Fig. l, the switch I of the ticker is connected to the outlet plug 2 representing a source of telegraphic impulses by means of the electric conductor 3 and is connected to the magnet 4 of the ticker by the electric conductor 5. The magnet 4 is connected by the conductor 6 to the outlet plug 2. It is to be understood, however, that the aforesaid electric connections are merely illustrative of the relation of the main'ticker switch or system and the ticker magnets in general.

The magnet 4 when energized is adapted to attract the armature l of the presser arm 8, which is mounted to pivot about the pin 9 extending through the bracket Ill. The presser arm 8, as illustrated, is preferably provided with a spring II which normally urges the free end of the presser arm 8 into engagement with the stop pin l2, The presser arm 8, in the present instance, is provided with a contact pin i3 having a contact head I4 formed at the end thereof to reciprocate between the contact blades l5 and I6 and engage the projecting ends of these blades l5 and I6 when the presser arm 8 is raised by means of the magnet 4. When so raised, the magnet I! is energized due to the fact that the contact blades [6 is connected to the magnet I! by the electric conductor l8 and that the contact blade i5 is connected to the magnet I! by means of the conductor 19, the source of current supply by way of the outlet plug 20 and-electric conductor 2 I.

The magnet I! when energized attracts the armature 22 which is pivotally connected at 23 to the standard 24. The armature 22'is provided with an extension 25 which is pivotally connected by means of the link 26 to the piston 21 slidably mounted in the cylinder 28. The cylinder 28 is adapted to be supplied with oil which passes downward from the upper end of the cylinder 28 to the lower end of thecylinder 28 through the passage 29 formed in the piston 21, but is prevented frompassing through the passage 29 in an upward direction from the lower end of the cylinder 28 into the upper end of the cylinder 28.

When the piston 21 moves downwardly, the check valve 30 obstructs the passage'of the oil. up through the passage 29 and compels the same to pass through the restricted passage 3i from the lower end of the cylinder 28 into the upper end of the cylinder 28. The restricted passage 3| is provided with a set screw 32 to regulate the passage of oil through the passage 3|. The extension 25 of the armature 22 is also provided with a spring 33 normally to retain the piston 2'! in the lower end of the cylinder 28 and the armature. 22 separated from the magnet ll. Preferably the tension of the spring 33 is made adjustable by the adjustment screw I02.

The armature 22 is provided with a yieldable contact spring 34 adapted to engage the contact plate 35 secured to the side of the bracket 36. The contact plates 34 and 35 are connected to the contact rings 31 and 38 respectively, the contact spring 34 being connected to the contact ring 31 bymeans of the conductor 39, the source of current supply by way of the outlet plug 40 and conductor 4|, and the contact plate 35 be-' ing connected to the contact ring 38 by means of the conductor 42. The rings 31 and 38 constitute parts of the magnet 43 which is adapted to cooperate with the face 44 of the clutch disk 45 freely mounted on the shaft 46.

The disk 45 has secured thereto the pulley 41 which is connected to the pulley 48 by the belt 48. The pulley 48 is mounted on the shaft 58 of the motor 5I. The motor 5I is connected to the outlet plug 52 by means of the conductor 53 connected to one of the blades of the plug 52 and by means of the conductor 54, variable resistance 55 and conductor 56 connected to the other blade of the plug 52.

The shaft 46 is fixedly connected to the magnet 43 and has secured thereto the worm 51 in mesh with the worm wheel 58 mounted in the housing 58. The worm wheel 58 is mounted on the shaft 68 which has secured thereto the tape drawing roller 6I maintained in engagement with the tape T by the pressure roller P, see 'Fig. 4. Resiliently to anchor the magnet 43 against coasting when de-energized, the spring 62 is provided which is compressed between the screw member 63 and the abutment 64 which engages the end of the hub 65 of the magnet 43. The tension of. the spring 62 is not sufficient to lock the magnet against rotation when energized.

In the embodiment illustrated in Fig. 2, the portion of the embodiment illustrated in Fig. 1 above the line aa is replaced by aloop controlled mechanism in which thetape T travels from the ticker 66 to the idler 61, and from the idler 61 to the projecting station or projector 68. Between the ticker 66 and the idler 61 the tape cooperates with the finger 68 at the upper end of the link 18 pivotally connected at its lower end to the platform H of the mercury switch 12. The platform H is pivotally connected to rock about the pin 13 on the standard 14. The mercury switch 12 is connected by the conductor 15 to the outlet plug 16, which outlet plug 16 is connected by the conductor 2 I, illustrated in Fig. 1, to magnet I1. The other end of the mercury switch 12 is connected by the conductor I8, illus-' trated in Fig. 1, to the magnet I1.

In Fig. 3 there is illustrated another embodiment of the portion of the embodiment illustrated below the line bb of Fig. 1. In the embodiment illustrated in Fig. 3, the conductors 4| and 42 are likewise connected to a. magnetic clutch, in this case being connected to the contact rings 11 and 18 respectively of the magnet 18 which is fixedly mounted on the shaft 88. The shaft 88 has fixed thereon the worm wheel M in mesh with the worm 82 in the housing 83. The shaft 84 of the worm 82 has fixed thereon the pulley 85 which is connected to the pulley 86 by the belt 81. The pulley 86 is connected to the shaft 88 of the motor 88. The motor 88 has one of its leads connected to the outlet plug 88 by means of the conductor 8| and its other lead connected by the conductor 82, resistance 83 and conductor 84 to the outlet plug 88. On the shaft 88, there is. freely mounted the tape drawing roller 85 which has a clutch disk 86 formed thereon for engagement by themagnet 18. For normally restraining the disk 86 from rotation by the magnet 18, the roller 85 is retarded by'the lever 81 fulcrumed at 88. The arm 88 of the lever 81 is connected by the spring I88 to the abutment I8I resiliently to restrain the disk 86 from rotation by the magnet 18.

with the embodiment illustrated in Fig. 2, the operation of the ticker forms slack in the tape T to permit the link 18 to descend and rock the I housing I I I.

mercury switch 12 to close the switch and energize the magnet I1 to attract the armature 22 in turn to cause the contact arm 34 to engage the contact arm 35. 'I'hereupon, when the ticker stops and the roller 6I of the embodiment illustrated in Fig. 1 continues to draw the tape T across the projector 68, it will take up the slack in the tape T at the finger 68 and thereby raise the link 18 to rock the mercury switch 12 to open the circuit. When so opened, the magnet I1 will be de-energized, but before the contact 34 disengages the contact 35, a short period of delay will ensue as a result of the slow motion device including the piston 21 operating in the cylinder 28, such delay being suflicient to prevent the separation of the friction disk from the magnet 43 if the interruption of the ticker were only momentary. As a result, it is obvious that the interruption in the movement of the tape will be considerably reduced and the movement of the tape only interrupted when the ticker is arrested for an extended period of time.

With the embodiment illustrated in Fig. 3, the magnetic clutch is interposed between the reduction gearing and the tape pulling roller 85. Ordinarily, it is preferred that the movement of the tape start gradually and come to rest gradually, in which case the portion of the'embodiment shown below the line bb of Fig. 1 should be used where the reduction gearing is interposed between the magnet and the tape drawing roller, and consequently is effective due to its inertia to extend the; period of acceleration when starting and the period of retardation when stopping. On the other hand, there areinstances where the period of acceleration and retardation must be reduced to a minimum in which case the embodiment illustrated in Fig. 3 would of course be preferred. In the embodiment illustrated in Fig. 5, there is illustrated a ticker. I83 of the high speed type from which the tape I84 is discharged and initially passes under the finger or roller I85 of the switch arm I86 operatively mounted in the switch box I81. .The tape then pass-es across the light aperture formed on top of the extension I88 of a the lamp housing I 88 and then passes down under the idler II8 rotatably mounted on the housing the rewind reel II4 journaled in the upper end of the bracket II5 extending upwardly from the The tape I84 is maintained in driving engagement with the tape pulling roller II2 by the pressure roller H6.

For driving the tape pulling roller II2, there is provided the worm wheel 1 fixed in the housing III to rotate with the pulling roller H2 and inmesh with the worm II8 mounted on the shaft II 8. The shaft I I8 has slidably fixed thereon to rotate therewith the outer clutch member I28. On-the shaft I I8, there is freely rotatable the sheave I2I which is connected by the belt- I22 with the sheave I11 of the motor I18. The sheave I 2I constitutes another clutch member to cooperate with the clutch member I28.

Theoperative relation of the clutch members I28 and I2I with the electric motor I18 and with the pulling roller H2 is substantially identical with that disclosed in the embodiment illustrated in Fig. 6 and will be described more in detail when describing the embodiment of Fig. 6. Suffice it to say for the present that the electric switch in the switch box I81 is connected to the conductors 222 and I23. 'The conductor 222 is connected clutches I20 and I2I to cooperate to drivingly connect the shaft HQ with the driving motor I18. In turn when the ticker comes to rest, the. tapepulling roller II2 will continue to advance the tape and thereby dissipate the loop formed by the arm I06 to raise the arm I06 and cause the switch to open and thereby de-energize the magnet I58 for the clutch members I20 and I2I.

In this embodiment in the usual way, the light rays will be directed upwardly through the tape disposedat the light aperture with the printed side of the tape facing downwardly, and then project the image impressed light beam' to the objective lens unit contained in the housing I26 and from there be projected onto the mirror I21 and ultimately appear on the screen I28 in upright readable position.

In the embodiment illustrated in Fig. 6, there is also used a high speed ticker in which advantage is taken of the movement of the bell crank bail I29 of the high speed ticker when the operation of the ticker is started to initiate the operation of the tape pulling roller. This bell crank bail I29 is in the present instance provided with an insulated bracket I30 having a conductive finger I3I at its free end positioned to engage the switch blades I32 and I33 formed on the block I34. The switch blade I32 in the present instance is connected by the conductor I35 with one side of the outlet plug I36 to a suitable source of current supply. a The outlet plug I36 is in turn connected by the conductor I3'I with the magnet I38 similar to the magnet II in the embodiment of Fig. 1.

The switch blade I 33 is connected by the conductor I39 to the other end of the winding of the magnet I38; The magnet I38 constitutes a part of a slow opening and fast closingdevice such as that illustrated in the embodiment. of Fig. 1, it being positioned to attract the armature i40 pivotally mounted at I 4I on the standard I42 and limited in its downward movement by the standard I43.

The armature I40 is provided with a flexible contact blade I44 to engage the flexible contact blade I45 when the armature I40 is attracted by the magnet I38 into its lowermost position. For maintaining the contact blades I44 and I45 separated, the armature I40 is provided with a spring I46 which connects the arm portion I41 spacedfrom the magnet with a suitable abutment. The free end of thearm portion M1 is connected by the link I48 with a piston I49 mounted in the cylinder I50. r

The cylinder I50 is filled with oil or other suitable liquid. The upper end of the cylinder is connected with the lower end of the cylinder by a narrow passageway II. For regulating the flow through the narrow passageway I5I there is preferably provided an adjusting screw I52. The piston I49 is-provided with a narrow passageway I53 having a check valve I54 secured to its lower end. As a result of the aforesaid, when the piston I49 is caused to ascend upon the before the blades I44 and I 45 will separate.

descent of the armature I40, the check valve I54 of the oil from the upper portion of the cylinder to the lower portion of the cylinder I50. On the other hand, when the magnet I38 is de-energized and the spring I46 acts upon the arm portion I" to lower the latter, the check valve I54 will obstruct the passage of the liquid through the passageway I53 and cause the same to move through the passageway I5I and thereby retard the downward movement of the arm portion I4'I.

Due to the fiexure of the contact blades I44 and I45, it will be necessary for the arm portion I 41 to descend considerably more than half way In view of the foregoing, it will thus appear that the interval between two succeeding sets of impulses required for transmitting two succeeding letters of a word will not be sufficient to cause the contactbla-des I 44 and I 45 to be separated and this slow motion device is also so adjusted that it I44 and I45, and break the motor circuit.

The contact blade I44 is connected by the conductor I55 with one side of the outlet plug I56. The other conductor I51 instead of the conductor I23 of the embodiment of Fig. 5 of the outlet plug I56 isconnected to one end of the winding of the magnetic coil I58. The other end of the winding of this magnetic coil I58 is connected by the conductor I59 instead of the conductor I25 of the embodiment of Fig. 5 with the contact blade I45. The magnetic coil I58 is supported by a suitable bracket I60.

Through the magnetic coil I58 extends the shaft II9 journaled in the housing III. The shaft II9 has fixed thereon the worm H8 in mesh with the worm wheel I IT. The .worm wheel III is fixed on the shaft I65 journaled in the housing III. .To one end of the shaft I65, there is fixed the sheave I66 connected by a belt I67 with the sheave of the rewind reel not shown in Fig. 6, such for instance as the reel II4illus trated in Fig. 5. The other end of the shaft I65 has mounted thereon the tape pulling roller II2.

The tape I04 after its discharge by the ticker crosses the light aperture, the same as in Fig. 5, in the present embodiment and will pass under the idler I I0 and then over the tape pulling roller H2 and then under the idler H3 and thereupon pass upwardly to the rewind reel, such for instance as the rewind reel II4 illustrated in Fig. 5. The tape is maintained in driving engagement with the pulling roller II2 by the pressure roller II6. Rotatably mounted on the shaft H9 is mounted the sheave I2I having a hub I14 centrally disposed of the magnetic coil I58 having will be free to permit the fairly rapid movement a clutch face I'I5 on the free end of said hub the clutch face I15 when the magnetic coil I58 attracts the disk I20.

Adjacent the end of the shaft H9, there is located the bracket I82 clearing the shaft H9 and serving as a brake for the same. The end of the shaft II8 has secured thereon the flat spring member I83 with its ends. extending under the straps I84 and I85, see. Fig. '7, formed on the outer face of the disk I20. The spring I83 operates with the end of the shaft H9 and the straps I84 and I85 normally to maintain the disk I20 and therefore the clutch face I8I out of clutching engagement with the clutch face I15 of the sheave I 2|.

The embodiment illustrated in Fig. 5 is equipped with a driving connection substantially identical to that interposed between the motor I18 and the pulling roller II2 of the embodiment illustrated in Fig. 6. With both of the embodiments illustrated in Figs. 5 and 6, a magnetic coil is energized acting as part of a magnetic clutch to cause the reduction gearing of the tape pull-.

ing roller to be connected to a continuously operating motor.

In the embodiment of Fig. 5, the magnetic coil is energized by a circuit including an electric switch associated with the switch arm I06 when the loop under the finger I05 is large enough topermitthe switch'arm I06 to drop into circuit closing position and in the embodiment illustrated in Fig. 6, the magnetic coil I58 is energized when the switch blades I44 and I45 engage due to the actuation of the bell crank bail I29.

The motor I18 is for the purpose of this invention continuously operating, it being associated with an-independent electric circuit, to wit that defined by the conductor I86, a source of electric supply by way of the outlet plug I81, the conductor I88, the resistance I88 and the conductor I90. In both embodiments, the sheave I2 I see particularly Fig. 6, is preferably provided with friction reducing bearings such as the bearings I9I and I82 and the disk I20 is slidably mounted on the shaft H8 but connected by the key I93 to rotate with the shaft H9. In this way, when the current to the magnetic coil I58 is de-energized the motor I18 will continue to rotate the sheave I2I although independent of the shaft H8 at this time, and the disk I20 and tape pulling roller II2 due to their connection with the shaft H9 and associated parts will immediately come to rest until the magnetic coil I58 will again be energized.

With the latter embodiment where the coil I58 is stationary, it will be seen that no provision need be made for collector rings, brushes and the like, such as required with the embodiment illustrated in Fig-1.

It is obvious that various-changes and modifications may be made to the details of construction without departing from the general spirit of the invention as set forth in the appended claims.

I claim:

1. The combination with a tape puller, of a continuously operating motor, a driven shaft operatively connected to actuate said tape puller, a sheave rotatably mounted on said shaftand operatively connected to be rotated by said motor, a.clutch having a clutch face fixed to rotate with said driven shaft, a magnetic coil associated with said clutch and sheave for attracting said clutch and sheave to clutchingly engage one another when said coil is energized, and means for controlling said coil as tape is ejected for advancement by said tape puller, said driven shaft and tape puller being free to come to rest under their own momentum when said coil is de-energized.

2. Thecombinationwith a tape puller, of a continuously operating motor, a metallic clutch member operatively connected to rotate with said motor, a'second metallic clutch member fixed to rotate with said tape puller, a magnetic coil operatively associated with said clutch members to attract said clutch members to clutchingly engage one another when said coil is energized, and means for controlling said coil as tape is ejected for advancement by said tape puller, said second clutch member and tape puller being free to come to rest under their own momentum when said coil is de-energized.

3. A clutch device for drivingly connecting the driven shaft of a tape puller with the drive shaft of a continuously operating motor including a sheave rotatably mounted on said driven shaft and drivingly connected to said motor, a metallic clutch disc fixed to rotate with but slidably mounted on said driven shaft, a spring connecting said driven shaft to said disc and normally maintaining said disc out of clutchingengagement with said sheave, a magnetic coil interposed between said disc and said sheave to enable said disc to clutchingly engage said sheave when said coil is energized, and means for controlling said coil as tape is ejected for advancement by the tape puller, said driven shaft being free gradually to come to rest when said coil is de-energized.

4. A clutch device for drivingly connecting the driven shaft of a tape puller with the drive shaft of a continuously operating mo of, including a sheave rotatably mounted on'said driven shaft and drivingly connected to said motor, a metallic clutch disc fixed to rotate with but slidably mounted on said driven shaft, said sheave and disc each having a hub mounted on said shaft adjacent to one another, means connecting said driven shaft to said disc for normally maintaining said disc out of clutching engagement with said sheave, a magnetic coil independent of but encircling the hubs of said sheave and disc to enable said disc to clutchingly engage said sheave when said coil is energized, and means for controlling said coil as tape is ejected for advancement by the tape puller, said driven shaft being free gradually to come to rest when said coil is de-energized.

5. A clutch device for drivingly connecting the driven shaft of a tape puller with the drive shaft of a continuously operating motor, including a sheave rotatably mountedon said driven shaft and drivingly connected to said motor, a metallic clutch disc fixed to rotate with said driven shaft,

. said sheave and disc each having a hub mounted on said driven shaft adjacent to one another, a magnetic coil independent of but encircling the hubs of said sheave and disc to cause said disc to clutchingly engage said sheave when said coil is energized, and means for controlling said coil as tape is ejected for advancement by the tape puller, said driven shaft being free gradually to come to rest when said coil is de-energized.

6. The combination with a tape puller, of a gized, and means for energizing said coil as tape is ejected for advancement by said tape puller,

said driven shaft being free gradually to come to rest when said coil is de-energized.

7. A tape pulling mechanism operable to come vto rest when the supply of tape thereto is interrupted comprising a tape puller, a continuously operating motor, a metallic clutch member operatively connected to rotate with said motor, a second metallic clutch member operatively connected to rotate with said tape puller and rotatable independently of said motor, a pivotally mounted bracket in engagement with the tape and normally deflecting the tape, and an eiectromagnet circuit including a magnetic coil and an electric switch operatively associated with said bracket,

said coil being operatively associated with said clutch members when energized to attract said clutch members to clutchingiy engage one another to rotate with one another, said bracket when rocked by the tension in the tape resulting when the supply of tape is interrupted to actuate said electric switch to open the electromagnet circuit of said coil in turn to de-energize said coil in turn to release said tape puller to come to rest of its own accord.

8. A tape pulling mechanism operable to come to rest when the supply of tape thereto is interrupted comprising a tape puller, a continuously operating motor having a drive shaft rotatable independently of said drive shaft, a driven shaft, a sheave rotatably mounted on said driven shaft and drivingly connected to said drive shaft, a metallic clutch member fixed to rotate with said driven shaft, a second metallic clutch member fixed to rotate with said sheave, a pivotally mountedbracket in engagement with the tape and responsive to deflections in the tape, and an electromagnet circuit including an electromagnet and an electric switch operatively associated with said bracket, said electromagnet being interposed between said clutch members to electro-magnetically attract said clutch members to engage one another to rotate with one another when said electromagnet is energized, said bracket when rocked by the tension in the tape resulting when the-supply of tape is interrupted to actuate said electric switch to open the electromagnet circuit in turn to de-energize said electromagnet to release said driven shaft.

9. In a data recording projection system, means to maintain smooth and feed a tape through said pulling device to pull the tape from the discharge 7 end of said system, air-actuating device, a-metallic clutch disc operatively connected to said actuating device, a magnetic clutch operatively connected to said pullingdevice, and means for energizing said magnetic clutch to clutchingly engage said clutch disc as the tape is ejected from a data recording device.

' 11. In a data recording projection system including a projection field, a tape drawing means for maintaining the tape smooth while it -is being drawn through said projection field, said tape drawing means including a tape drawing roller beyond the discharge end of said projection field, an actuating device, a magnetic clutch for connecting said drawing roller with said actuating device. and means responsive to deflections in the tape in advance of said projection field as it is fed to said projection field for electrically connecting said magnetic .clutch to actuate said drawing roller.

12. In a data recording projection system including a projection field, a tape pulling device adapted for pulling a tape through said projection field-as the said tape is fed to said projection field beyond the discharge end of said projection field, an electric motor, a reduction gearing ,operatively, connected to said tape pulling device, a magnetic clutch operatively connected to connect said electric motor to said reduction gearing when energized, and means responsive to deflections in the tape in advance of said proilection field for electrically connecting said ma etic clutch to actuate said drawing roller.

13. In a data recording projection system including a projection field, the combination including a tape pulling roller for pulling a tape through said projection field as it is fed thereto disposed beyond the discharge end of said projection field, a driven shaft, a driven sheave rotatably mounted on said shaft, an electric motor operatively connected to said sheave, a magnetic clutch disc fixed to rotate with said sheave, a reduction gearing operatively connected to said tape pulling roller and said driven shaft, a rotatable magnetic clutch fixed to said driven shaft to cooperate with said disc when energized to con 'nect said sheaveto said driven shaft, and means responsive to deflections in the tape in advance of said projection field as it is fed to said projection field for electrically controlling said magnetic clutch to said clutch disc.

14. In a data recording projection system in-, cluding a projection field, the combination of means fordrawing the tape through said projection field from the discharge end thereof, said means including a driven shaft, a tape pulling roller freely mounted on said shaft, a magnetic clutch disc fixed to said roller, a magnetic clutch fixed to said shaft, and means responsive to deflections in the tape in advance of said projection field as the tape is fed thereto to clutchingly engage said clutch disc and thereby actuate said tape pulling roller.

AUGUST D. EITZEN. 

